Mining-machine.



H. A. KUHN & W. W. MACFARREN.

MINING MACHINE.

APPLICATION FILED JAN.2, I909.

Patented Aug. 3, 1915.

m m 2 IN NA w mmohzm z w III ' 1 -.IIII.: IIIIIIIIIIIII Adi mmmmuzh H. A. KUHN & w. w. MACFARREN.

MINiNG MACHINE.

APPLICATION FILED JAN.2. 1909.

imagwa;

Patented Aug. 3, 1915. f [E INVENTOHS 0 %m% MLNING MACHINE. APPLICATION FILED JAN.2,1909.

l m m l, n m

GUM N u S E Am v Q m w W W 1 ED s rains PATENT c i HARRY A. KUHN MINING-MAQH1NE.

To all whom it may concern Be'it known that we, HARRY A. KUHw and WALTER V. MACFARREN, citizens of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Mining-Machines, of which the following is a specification.

The objects of'our nvention areuto provide a machine which will mine the entire Referring to the drawings, Figure 1 is a.

plan View of our improved machine inworking position in a room or entry. Fig. 2 is a sectional elevation through a coal seam, showing the machine 1n .worklng position.

, Fig. 3 is a rear elevation of the machine.

Fig. f is a sectional'elevation through the front truck and its supporting'iand driving means, taken on the line 1-1 of "Fig. 2. Fig. 5 is a combined sectional and outside view of one of the cutter bars. Fig. 6 is an end view of the front end thereof. Fig. 7

is a sectional view through one of the feeding iacks. Figs. 8, 9, 10, 11, and 12 are sec:

tional elevations through'an entry, showing the different forms of cuts which. the machine is adapted to make in the coal'. Fig. 13 is a diagrammatic elevation of the driving gears forthe cutterbars and the feed screws, taken on the line 2-2 of Fig. 1, and Fig. His a detail of an inserted cutting tooth. Fig. 15 is an elevati'onshowingthe worm drive from the motor to the cross shaft, actuating the reartruck wheels. Fig. 1

16 is an eleyation of the same at right angles thereto. Fig. 17 is a diagram illustrating the fluid pressure connections to the various cylinders; and Fig. 18 is a sectional iew of a four-way valve. 7

The machine consists of a frame 1, constructed of any suitable material, preferably of rolled or wrought steel. At the front Specification of Letters Patent.

AND} WALTER W. MACFARREN, or .PITTSBURGH, PENNSYLVANIA;

SAID MACFARREN .assrouon'ro SAID KUHN.

end of theframe, thereiare mounted sincutting elements, comprising rotary bars with inserted cutting teeth and consisting of the upperibars 2, the'middle bars 3, and the. I 'lowerbars 4.. a

There are two upper bars '2,'and two lower bars hand these'four bars are of duplicate COIlStltlCtlOIl and interchangeable. The mounting of the upper and lower bars .is

- Patented Aug. 3, 1915. Application filed January 2, 1909. Serial a... 470,292.

also the same, and the driving means are in duplicate, so that a description of. these arrangements for one bar will cover the other three. r 1

The bar 2 is secured'to aninclined shaft 5,

which is supported in the'fron't bearing 6 and the rear bearing 7." The rear bearing 7 is pivotedabout a pin 8, adj acent to the driving gear 9, this latter being secured to the shaft 5. The front bearing 6 is bolted to the forward endof the frame 1, by bolts passing through the slot holeslO. The effect of this mounting is that the shaft 5 and thebar 2 may be oscillated about the center 7 of the pin 8 to raise or' lower the bar a cer- I tain amount. The lower bars 4 are-secured Y .to the ends of shaft 11 in a precisely similar manner, so that ,theymay be vertically ad- .usted the same as the upper bars. The cf feet of raising or lowering the'lower bars is; a

to cause, the machine as a whole to raise or lower itself in the seam of coal, as this .ad-,',

justment changes the relation between the bottom out and the supporting truck wheels. resting on that: cut. This adjustment, there-f fore,- provides means adapted for following i the contour of the coal scam.

'The, effect of adjusting the upper bars is tochange the height of the out made by the machine so that this adjustment is adapted to meet small variations in the I thickness of the coal, which are of frequent occurrence. l

By reason of the inclination of theishafts 5 and 11, the driving gears 9 and 12 are kept within the cuts made by the bars 2 and t. {Ag further reason for the inclination of theshafts 5 and 11 is that it allows the use 'of a tapered cutter bar, which is naturally the strongest form, and at the same time all'ows Q the cuts made by the upper and lOWGI' JQf these 'bars to be parallel and continuous planes.

The intermediateset of cutter bars '3 also provided for purposes hereinafter set forth. These bars are securedto the ends of shafts 13. v The front ends of the shafts 13 to cut verticalslots in the coal. I

v ward from its normal positiomand by adare'supported in bearings14, and the rear ends of the same engage universal joints 15, which are secured to shafts 16 supported in bearings 17 and 18.

The bearings 14 are guided in curved slots 19 formed in the front casting 20,

which is-secured to the frame 1. The eflect vided at their rear ends with the projections 25, whichare engaged by the plungers 26 of the fluid pressure cylindersj27 and 28,there being a pair of these latter on each side ofthe machine secured to the frame 1. By admitting fluid pressure to the upper cylinders 27, the cutter bar 2 will be fed -downmitting fluid pressure to the lower cylinders 28, the reverse action will take place. The above described mechanism is adapted to oscillate the cutter bars 3 in vertical planes, but as these bars 3 are also required to make horizontal cuts when the machine is swung,

a locking device to hold the cutter bars 3 in a horizontal position shown in Fig. 2 is pro- Vided as 'follows:A double-ended, doubleacting fluid pressure cylinder 29 is secured to the front casting 20. This cylinder is provided with a pair of piston rods 30, the

. same extending through the lugs 31 of the casting 20, and passing through properly located-holes 32 in the swinging arms 21. The piston rods 30 are provided with pointed ends to facilitate their entrance into the .holes 32. When fluid pressure is equally applied to the cylinders 27 and 28 and there is .no strain on the bars 3, theywill assume Now, if fluid pressure is applied to the inner a horizontal position as shown in Fig. 2.

ends'of the double cylinder 29, the piston rod 30 will be forced outward until their ends engage the holes 32 in the swinging arms 21 and lock the same firmly in mid-position. When it is desired to make vertical cuts I with the bars 3, the controlling valve for cylinder 29 is thrown to retract the piston rods 30, which allows free vertical movement of the swinging arms 21, so that they can then be acted upon by the cylinders 27 v and 28 to make vertical cuts.

The front end of the machine is support ed on a truck comprising the following parts :The casting 33 is secured to the upper parts of the frame 1. This casting- 33 is provided at its lower face with a turn table 34, engaging the balls 35. Above the turn table, 34, there is formed a bearing 36. Below the turntable 34 there is placed a swiveling axle-housing 37, provided with the trunnion 38, extending upward through the bearing 36. The turn-table 39 on the axle-housing 37 also engages the balls 35.

The axle-housing 37 is provided with a pair of bearings 40 mounted a pair of bevel gears 42 and 43.

44, extending through the bearing 40, and having secured to its outer end, the truck Wheel 45. The gear 43 is provided with a long sleeve 46 extending through the bearing 41, and having'secured to its outer end the truck wheel 47. The axle 48 passes through the interior of sleeves 44 and 46 and 1s provided with nuts 49 and washers 50 at its outer ends to secure the wheels 45 and 47 endwise. The wheels 45 and 47 are power operated through the worm wheel 51 secured, to the upper end of the shaft 52, which ex tends downwardly through'the trunnion 38,

and carries at its lower end, a be el pinion 53. This bevel pinion 53 engages a bevel gear 54, which is loosely mounted on the sleeve 46. The bevel gear 54 is provided with lugs 55 carrying the pins 56, upon each of which is mounted a bevel pinion 57. These latter engage with bevel gears 5 42 and 43 and form a well-known form of differential gear.

' It is evident from the above description, that when power is applied to the worm wheel 51 in either direction, it will cause a corresponding rotation of the truck wheels 45 and 47; and that if these wheels be describing a curve, the above described differential mechanism will operate to compensate 'for the various lengths of travel of wheels 45 and 47 Y A flange 58 is formed on the turn-table 39, and teeth are formed on this flange, comprising the spur gear 59, which engages with and 41 between which is The gear 42 is provided with a long sleeve a spur pinion 60 upon the lower end of a shaft 61, the same being supported in suitable bearings and carrying at its upper end a se'condspur pinion 6.2, which engages rack teeth 63 on a double-ended plunger 64, mounted in the fluid pressure cylinders 65,

these latter being secured to the frame 1.

The fluid pressure cylinders 65 are of such a stroke that when the plunger 64 is at one end of its stroke, the truck wheels 45 and 47 will be in the position shown in Figs. 4 and 2; and when the plunger 64 is at the opposite end of its stroke, the axle 48 will bein a position at right angles to the position shown in Fig. 4. By the above means,

the front truck wheels 45 and 47 may be steered for the transportationof the machine about the mine,and they may also be readily thrown from a position' adaptedto' motions of the machine. The front end of the armature shaft 67 carries the spur gear 68, which. drives a spur gear 69 mounted upon the shaft 70, the same being support- I .ed in the bearings 71 and 72. The shaft 70 carries a worm 73, which meshes with the worm wheel 51,which drives the front truck wheels 45 and 47. The rear end of the armature shaft 67 carries a gear 74-, the same meshingwith four idler gears 75. The arrangement of these gears is best shown in Fig. 13.

The two upper idler gears 7 5 engage the drive gears 9 upon the shafts 5, and the two lower idler gears 75 engage the gears 12 on the shafts 11. mounted upon .pins 76, the same being secured to a casting 77 fastened to the frame 1. The gears 75 also mesh with and drive a pair of gears 78, mounted upon the shafts 16, which drive the middle cutter bars 3.

The'gears 9, 12, 7d, 75, and 78 are all substantially in one plane in the present design. The shafts 5 and ll being inclined to a horizontal position, and the armature shaft 67 being at an. angle to the shafts 5 and 11, the gears 7%, 75, 9 and 12 should properly be bevel gears with a very acute shaft angle. They may be so made in the present design, and the gears 78 may be spur gears of approximately the 'form of spur gears, with their teeth mangled somewhat to allow of meshing with the bevel gears 75.

The machine is fed forward as a whole, to start the cutter bars 2, 3, and 4 into the coal by'the following mechanism :The vertical fluid pressure jack 79, provided with upper and lower plungers 80, is mounted upon the rear axle 81, the lower plunger 80 endwisemovementby the nuts 91.

nels are secured to the extension-arms 85,

these latter being in telescopic engagement with the frame 1. A pair of feed screws 86 are secured to lugs 87 .on the jack 79. These screws 86 extend through threaded sleeves '88, supported in the bearings 89. Spur gears 90 are keyed to the rear ends of sleeves 88, and secured aga llnst he spur gears 90 are driven fromthe armatufe shaft 67 by means'of the spur pinion 92,

through the medium of thefidlers 93 mounted upon the pins 94-. The spur pinion 92 is connected at will to the armature shaft 67,

The-idler gears 7 5 arev 105 secured to the frame 1.

so-as' to drive the screws" 86. The threads on screws 86 are arranged so that the machine isfed forward when the motor 66 is running in the proper rotating direction to drive the cutter bars 2, 3, and 4, and the screws 86 can be. retracted to a position for starting another feeding stroke by reversing the motor 66 when the cutter bars are not in action, as will be described. later. The axle 81'is provided with a pair of truck wheels 95, each of these having secured to it a sprocket 96. The idler sprockets 97 and 98 are mounted on brackets secured to the cross beams 81 and the telescopic bars, 85.

The armature shaft 67 carries at itsextreme outer end a worm 99, engaging a worm wheel 100, mounted on the cross shaft 101. This cross shaft 101 is a divided shaft and provided with a diiferential gear 102, connecting the worm gear 100 with the two members of the shaft 101, in a manner similar to the differential mechanism illustrated for the front, truck wheels Each end of the shaft 101 is provided with a driving sprocket 103. A pair of idler sprockets 104: are mounted in take-up frames Another pair of idler sprockets 106 are securedio the telescopic bars 85,- and a chain 107 ispassed around the sprockets 103, 101,106, 96, 97, and 98, as plainly shown in Fig. 2. T

It will be observed that the sprockets 103 and 101 are fastened to the main frame 1, and that the other four sprockets are fastenedto the telescopic members 85. It will vides a flexible drive, permitting the driving sprockets 103 to transmit power to the sprockets 96 of the rear truck wheels, '95, in any relative position of the rear truck wheels 95 to the frame 1. 1

From the above description, and from the previous description of the drive of the front truck wheels, it will be seen that we have provided power driven mechanism actuating all the truck wheels, and have also provided power actuated steering mechanismfor steering the front truck wheels.

The worm 99 may be connected at will to the armature shaft 67 by a clutch 108, so

45 and 47..

'be evident that the above arrangement prothat the rear truck wheels may be driven independently of, or simultaneously with, the front truck wheels. At the forward end of the machine there is provided a pair of jack cylinders 109, these being pivoted about the pin 110,'which latter is secured to the frame 1. v

' The detail construction of the jack cylinders 109 is illustrated in Fig. 7. The plunger 1 11 enters the cylinder 109 through the stuffing box 112. The plunger 111 is to provide extensions of the plunger 111,

which may be successively applied thereto to swing the front end of the machine across the out being made. The extensions consist of a piece of pipe 117 of considerable length, having the open rear end, which is adapted to slip over the pointed member 115. The point of the pipe extensions is provided with a second. point 118 adapted to engage the side of the cut. The plungers 111 extend through slots 119 in the sides of frame 1. i

In Fig. 5, we have shown the detail construction of cutter bars 2 and 4. The cutter bar consists of a piece of forged or cast steel 120, around the outside of which is formed the double screw thread 121. Tapered holes 122 are formed in the screw thread 121, and.

. end of the bar, until they reach the least projection as shown at 124. The purpose of this arrangement is to allow the bits 123 to bereground or redressed when worn, and to be moved gradually further down the bar when reinserted therein to allow for wear. The helical mounting of the bits together with the thread cut on the bar forms a helical conveyer, which is adapted to rapidly withdraw the cuttings as fast as made and insure a free cutting action of the teeth.

Fig. 5 illustrates the detail construction of cutter bars 2 and 4. The construction of cutter bar 3 is quite similar,'the only difference being in the degree of taper in the bar. All the cutter bars are adapted to be fed endwise into, the coal. in starting a cut, and to provide for this action, the-front end of the bar is fitted with a cap 125 having the lips 126 similar to those on an ordinary flat drill, and being also provided with the side cutting or milling edge, 127. The cap 125 is screwed onto the end of the bar 120 by a tapered thread 128. The bar as a whole is secured to its driving shaft by a similar tapered thread 129. The driving shafts 5, 11, and 16 are provided with a central hole 140, consurrounding the shafts 5, 11, and 16. This air will pass to,the "rfi*ont end of the cutter barthrough the holes @130 and 131 to the small holes 133. A space 132 is left between the end of the bar 120, and-tit nteripr end er passing mas ers through hole 131 enters this space'l and is conducted thence to the front eDCl IG hecap 125 by a pair of small holes 133. Theprd jection. of the cutter bars into the coal will usually be from five to six feet and the de sign of cutter bar illustrated in Fig. 5 is well adapted to sustain the load on the bar, which is similar to that of a cantaliver beam. In addition to this, the torque of the bar increases regularly from front to rear. '75

A further and most important advantage in the tapered form of bar consists'in the fact that when mounted on the inclined shaft, such as 5 or 11, the taper of the bar and the inclination of the shaft can be so proportioned relatively that the cut made by the bar will be parallel to the length of the machine, and that as the machine is advanced the bars will operate to cut a plane, leaving no'ridges or undulations to be encountered by the truck wheels.

A further advantage obtained by making the cutter bars detachable from their shaft is that each bar may be separately handled by two men, and a full set of bars may be readily handled on a truck. The bars being readily detachable when the cutters become worn, the whole bar is removed and replaced by a duplicate in a few minutes, instead of it being necessary to separately remove and replace each cutter, of which there will be upward of in each bar.

A further advantage in this detachable feature consists in the fact that the cutter. bars may be conveniently transported to a .100 favorable place for resharpeni-ng, and the form and dimensions of the bar are such that if desired, a special machine of simple character may be employed to grind the cutters, without taking'them from the bar. In Figs. 8, 9, 10, 11, and12, we. have shown a variety of combinations of cuts,- which may bemade by our improved machine. In all the above figures, the upper cut 134 is made by the upper cutter bars 2. Lower out 135 is made by the lower cutter'bars 4,

and the middle cut 136 is made by the middle cutter bars 3. The vertical cuts 137 are also made by the middle cutter bars 3, when the same are oscillated as herein before described.

The preferred combination of cuts for a. room or entry is that shown in Fig.12, in which there are three horizontal and four vertical cuts. It is obvious, however, that by 139 the omission of the middle cutter bars 3 the machine is equally well adapted to make the combination of cuts shown in Fig. 8, and by the omission of cutter bars 2, to make the combination of cut shown-in Fig. 9. A35 The coal lying between the cuts 134 and in Fig. 8 would have to be brokenup considerably, in order to load it out of the mine, as theflumps shown between these cuts are tooflarge to be handled. The same 1% used comparatively to presentpractice toarea-ere statement is'true with reference to the lumps above and below cut 136 in Fig. 9, and in addition to this, the lump above cut 136 would have to be wedged down. V

The combination of cuts shown in Fig. 10 is made by merely omitting to use the vertical oscillating movement of cutter bars 3.

and the combination of cuts shown in Fig.

11, dispenses with two of these. Any of the five combinations of cuts shown are appli-.'

cable for mining purposes, and our 1mproved machine could be advantageously makeany of thenn, IIOW8Y8I,1I1 an entry, the usual width Of'WlllCll 15 from 8 to 12 feet, the most convenient sub-div1s10n of the coal is made bythecombination of cuts shown in Fig."l2; and for a. wider entry or room, a

similar arrangement of cuts would be proper, making the sub-division between the vertical cuts about as shown in Fig. 12.

A small air pump, 137 is mounted. on the frame 1, at'the forward end of the motor 66, and may bedriven from the motor shaft 67 by any convenient. driving means. The I pump 1-37 is adapted to compress air nto the reservolr 138, from which 1t may be led to operatethe various fluid pressure cylinders above described. As the operation .of these cylinders 1s 1nter'm1ttent,'a small pump running constantly will supply sufficient air, provided the reservoir capacity is of sufficient size. i

The operation of our improved machine is as follows -The machine'is brought to a position with the ends 126 of the cutter bars adjacent to the face of the coal, with the ing plungers 30. Fluid pressure is then apjack cylinder 79 at its inner position, 2'. 8., close to the rear end of the frame 1. Fluid pressure is then applied to clamp the jack 79. The motor 66 is then started in the proper direction tosdrive the cutter bars,

and the clutch 108 is thrown in to supply power to the screws 86. The cutter barsare thus forced slowly into the coal until they are fully engaged as shown in l igs. l and 2. When the cutter bars have reached the full depth of'cut, fluid pressure is applied to the outer ends of locking cylinder 29 to release and hold out of engagement the lockplied to cylinder 27 to oscillate the cutter bars 3 vertically downward, which make the left hand pair of cuts 37 as shown in Fig. 12.

When the'bearing it has reached its last position, as determined by the lower end of the slot 19, the fluid pressure is released from cylinder 27and applied to cylinder 28,

which brings thecutter bars 3 up to their normal level position, and starts them to make an upward vertical out. At the ,-exp1- ration of this cut, fluid pressure is released from cylinder 28, allowing the cutter bars 3 to drop to their normal level osition, or the fluid pressure may-he retained to cylinder 28 and applied to cylinder 27, which will pro-'- duce the same result on account of the bal anced action of the cylinders. Fluidpressure is then applied to cylinder 29. to throw in the locking device, and is also applied to the left hand jack 109 to cause the front'end of the machine to swing toward the right. At the same time fluid pressure is admitted to one of the cylinders :65 to place the front truck wheels 4:5 and 47 in position to swing across the entry. This swinging motion is I continued until'the machine has traversed the full width of the entry, at which time the-fluid pressure isreleased from jack 109,, f i

the front truck wheels are swung back to their original position as shown-in Fig. 42-

the locking plungers 30 are released, and

fluid pressure is applied to the cylinders 27' v to make yertical cuts as before, after which it 1s again applied to the cylinders 28 to finish these vertical cuts. At the expiration of this process, the combination of cuts shown in Fig. 12 is complete, the cutter bars" 3 are returned to their normal level position,- and the machine is backed for some little ,distance down the entry or room'by apply ing the power of the motor 66 to drive the truck wheels.

' In the claims, allwords cutterbar or rotary cutter bar are intended to mean a bar adapted to be fed sidewise through the coal, in a direction perpendicular to its axis in rotation, and adapted to cute slot therein, as distinguished from a drill which is fed endwise into the coal to cut a circular hole.

The lumps of coal hanging as shown in Fig. 12 may be readily broken down by any desired mechanism, such as acrow-b'ar, and

are then ready for removal.

The above description covers the pfe-y ferred method of operating our improved machine, and it is obvious that it might be operated in manyother ways. It is further obvious, that the various mechanisms and arrangements of parts may be varied wlthin wide limits by those skilled in the art of die signing and constructing such machines,

rality of rotary cutter bars carried thereby 1 and arranged to make simultaneously three substantially horizontal cuts. in the coal at difierent levels, said middle cut. havlng parallel sides, said upper and lower'c'uts be ing wedge shaped and the-upper side of the upper out being parallel to the lower side ofthe lower cut.

' 3. In a mining machine, a frame, a rotary cutter bar rigidly mounted thereon, meansfor swinging the frame to cause said cutter bar to cut a horizontal slot 1n the coal, a

second'rotary cutter bar pivotally connectedto said frame so as to swing in a vertical overcut when the frame is swung, and a third cutter bar pivotally'mounted on said frame between said first two bars, which may make either a horizontal .cut between said undercut and said overcut when the frame is swung, or a vertical cut when the bar is oscillated with respect to the frame,

and means for oscillating said third cutter bar in a vertical plane.

- 5. In a mining machine, a frame, six

rotary cutter bars carried thereby, driving means therefor, means for simultaneously advancing all of said cutter bars endwise into the coal, means for traversing all of saidbars sidewise to make horizontal cuts,

and means for traversing two of said bars vertically to make vertical cuts.

6. In a mining machine, a frame, a plurality of rotary cutter bars carried thereby, driving means therefor, means for simultaneously advancing all of said bars endwise into the'coal, means for traversing certain offsaid bars sidewise to make horizontal cuts, and means, for traversingcertain other of said bars in another direction to make cuts at an angle to said first mentioned cuts.

7. In a mining machine, a frame, a motor mounted thereon, cutting elements carried by said frame, and driven by said motor, front and rear wheels supporting said frame, driving connections between said motor and I all of said wheels to feed the cutting elements into the coal, power actuated means for steering said front wheels to allow of said cutting elements being swung sidewise to make their cuts, and means for swinging the frame.

' 8. In a mining machine, a tapered rotary cutter bar, a number of inserted cutters on the outer surface of the same, and duplicated seats for said cutters, said cntters increasing regularly in length from the small end to the large end of said bar.

9. In a mining machine, a tapered rotary cutter bar adapted to cut a wedge shaped slot in the coal, and a series of inserted cutters of graded length adapted to be arthe original size of the slot cut.

10. In a mining machine, aframe, having a vertical ground engaging pivot at the rear end thereof, a rotary cutter'bar mounted for oscillation in'a vertical plane to the 'fmnt of said frame, means for driving said cutter bar, means for oscillating it to make ranged on the bar when worn, to preserve a vertical cut, and means for swinging the machine'about its pivot to make a horizontal out.

11. In a mining machine, a main frame, a supplementary frame rearwardly extensible from said main frame, clamping and pivot-- ing means carried by said supplementary frame, mechanism for controlling the extension of said supplementary frame, and mechanism for swinging said frames about said pivot. 1

12. In a mining machine, a mainframe, a supplementary frame rearwardly extensible from said main frame, a combined clamp and pivot secured to said supplementary frame, a motor, mechanism driven by said motor for controlling the extension of said supplementary frame, and mechanism also driven by said motor for swinging .said frames about said pivot.

13. In a mining machine, a main frame, a supplementary frame rearwardly extensible from the main frame, a combined clamp and pivot secured to said supple- 'mentary frame extensible from said main frame, a truck wheel secured thereto, a

driven sprocket connected to said truck wheel, idler sprockets mounted on said supplementary frame, and an endless chain engaging said sprockets and arranged to transmit power from the driving to the driven sprocket to propel the machine; a

In a mining machine, a frame, cutting devices moimted at the front end thereof,front and rear wheels supporting said frame, means for driving all of said wheels to feed the cutting devices into the coal,

means for steering the front wheels to allow said frame and said cutting devices to be swung sidewise to make their cuts, and means for swinging the frame.

16. In a mining machine, a frame, power actuated cutting devices, arranged to make a vertical cut and a horizontal cut in the for drivingsaid wheelsjto feed the cutting coal supported at the front end thereof,'whe'elsi' in supporting relation to said frame, means devices into the coal, means for steering said Wheels to allow saidcutting devices to swing sidewise; and means to swing the frame.

17. In a mining machine, a frame, means a to make a horizontal cut near the floor,

means to ,feed two cuttef bar's endwise into.

the 3003/1 near the roof, power V actuated means to lo'wer the cutter bars through the coal thereby severing the' coal at-the bottom 

